<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            div{
                width: 100px;
                height:100px;
                border: 1px solid red;
            }
            div:hover{
                /*margin: 20px 0 0 20px;*/
                /*修改相对定位*/
                position: relative;
                top:20px;
                left:20px;
            }
        </style>
    </head>
    <body>
        <div>div1</div>
        <div>div2</div>
        <div>div3</div>
    </body>
</html>